KR20140123846A - Method and apparatus for transmitting power headroom report of user equipment in wireless communication system - Google Patents

Abstract

Provided are a method and an apparatus for transmitting a power headroom report (PHR) of user equipment in a wireless communication system. The method comprises the steps of: triggering a PHR based on loss and change of a path or a periodic timer; configuring a delayed PHR for uplink transmission to a first base station (BS) with no scheduler, and storing the delayed PHR in user equipment; and transmitting the delayed PHR to a second BS with a scheduler through an uplink set to be connected to the second BS, wherein the delayed PHR further includes PHR delay information indicating how many subframes are transmitted with delays.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for transmitting a surplus power report of a terminal in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting a surplus power report by a terminal connected to a plurality of heterogeneous base stations.

The base station can use the power headroom information of the UE to efficiently utilize the resources of the UE. Power control technology is a core technology for minimizing interference factors and reducing battery consumption of terminals in order to efficiently allocate resources in wireless communication.

When the terminal provides the residual power information to the base station, the base station can estimate the uplink maximum transmission power that the terminal can afford. Therefore, the base station can provide uplink scheduling such as transmission power control, modulation, coding level, bandwidth, and the like within a range not exceeding the estimated maximum UL transmission power.

On the other hand, the terminal can receive services through different frequency bands from a small base station including a small cell and a macro base station including a macro cell. This is also called a dual connection of the terminal.

There is a need for a method for efficiently allocating uplink resources in a process of redundant power reporting by a UE with a dual connection.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for transmitting surplus power reports.

Another aspect of the present invention is to provide a method and apparatus for transmitting a surplus power report based on a connection setting of a terminal.

Another aspect of the present invention is to provide a method and apparatus for transmitting a surplus power report by a terminal connected to a small base station and a macro base station.

Another aspect of the present invention is to provide a method and apparatus for transmitting an excess power report in accordance with a downlink or uplink connection of a terminal.

According to an aspect of the present invention, a method of transmitting a power headroom report (PHR) by a terminal in which two or more different base stations and an uplink wireless connection are established as a dual connection is performed based on a path loss change or a periodic timer PHR, constructing a delayed PHR for uplink transmission to a first base station in which the scheduler does not exist, storing the delayed PHR in the UE, and storing the uplink in the UE, And transmitting the delayed PHR to the second base station through the second base station, wherein the delayed PHR further includes PHR delay information indicating how many subframes are transmitted in a delayed manner.

According to another aspect of the present invention, a method of transmitting a power headroom report (PHR) by a terminal in which two or more different base stations and an uplink wireless connection are established in a dual connection is performed based on a path loss change or a periodic timer PHR, storing a delayed PHR for the second base station if the TA value for the second base station is different from a time advancing (TA) value for the first base station, And transmitting the delayed PHR to the first base station when the uplink is triggered, wherein the first base station is a base station corresponding to a pTAG (primary TA Group), and the second base station transmits a secondary TA Group And the delayed PHR further includes PHR delay information indicating how many subframes are transmitted in a delayed manner

According to another aspect of the present invention, a terminal that transmits a power headroom report (PHR) with two or more different base stations and an uplink wireless connection is set as a dual connection, A triggering unit for triggering the PHR, a delayed PHR (delayed PHR) for uplink transmission to a first base station in which the scheduler does not exist, and storing the delayed PHR in the UE, and an uplink And a transmitter for transmitting the delayed PHR to the second base station via the second base station. The delayed PHR further includes PHR delay information indicating how many subframes are transmitted in a delayed manner.

According to another aspect of the present invention, a terminal that transmits a power headroom report (PHR) with two or more different base stations and an uplink wireless connection is set as a dual connection, A controller for storing a delayed PHR for the second base station if a TA value for the second base station is different from a time advancing (TA) value for the first base station, and a controller for storing the delayed PHR for the second base station, And transmitting the delayed PHR to the first base station if the uplink for the uplink is triggered, the first base station is a base station corresponding to a pTAG (primary TA Group), and the second base station corresponds to a secondary TA Group , And the delayed PHR further includes PHR delay information indicating how many subframes are transmitted in a delayed manner.

According to the present invention, a surplus power report can be efficiently delivered in a situation where dual connectivity between a macro cell and a small cell and a terminal is configured in a network, and the uplink resource allocation can be more effectively performed based on this.

1 shows a wireless communication system to which the present invention is applied.
2 shows an example of a dual connection situation of a terminal applied to the present invention.
3 is an example of a case where a terminal establishes a dual connection with a small base station and a macro base station.
FIG. 4 shows another example of a case where a terminal establishes a dual connection with a small base station.
5 is a flowchart showing an example of a procedure for a terminal to report an excess power report according to the present invention.
6 shows an example of a terminal triggering a PHR based on a change in path loss value.
7 is a view for explaining an example of a PLR setting applied to the present invention.
8 is a view for explaining an example of the PHR blocking timer setting.
Figures 9-15 illustrate a specific embodiment for transmitting a delayed PHR in accordance with the present invention.
Figures 16-21 illustrate an example of a PHR MAC CE that includes a delayed PHR in accordance with the present invention
22 is a flowchart showing an example of the operation of the terminal reporting surplus power according to the present invention.
23 is a flowchart showing an example of the operation of the base station reporting the surplus power according to the present invention.
24 is a block diagram showing an example of an apparatus for transmitting and receiving a surplus power report according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Also, in order to clearly illustrate the present invention in the drawings, portions not related to the present invention are omitted, and the same or similar reference numerals denote the same or similar components.

1 shows a wireless communication system to which the present invention is applied.

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system 10 includes at least one base station 11 (BS). Each base station 11 provides communication services to specific cells (15a, 15b, 15c). The cell may again be divided into multiple regions (referred to as sectors).

A user equipment (UE) 12 may be fixed or mobile and may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, (personal digital assistant), a wireless modem, a handheld device, and the like. The base station 11 may be called by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, a femto base station, a home node B, . The cell should be interpreted in a generic sense to denote a partial area covered by the base station 11 and is meant to cover various coverage areas such as a megacell, a macro cell, a small cell, a micro cell, a picocell, and a femtocell.

Hereinafter, downlink refers to communication from the base station 11 to the terminal 12, and uplink refers to communication from the terminal 12 to the base station 11. In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11.

The wireless communication system can be classified into a Code Division Multiple Access (CDMA), a Time Division Multiple Access (TDMA), a Frequency Division Multiple Access (FDMA), an Orthogonal Frequency Division Multiple Access (OFDMA), a Single Carrier- , OFDM-TDMA, and OFDM-CDMA.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In the physical layer, the following physical control channels are used. The physical downlink control channel (PDCCH) informs the UE of resource allocation of a paging channel (PCH), a downlink shared channel (DL-SCH), and hybrid automatic repeat request (HARQ) information related to the DL-SCH. The PDCCH may carry an uplink grant informing the UE of the resource allocation of the uplink transmission. A DL-SCH is mapped to a physical downlink shared channel (PDSCH). A physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe. The physical hybrid ARQ indicator channel (PHICH) is a downlink channel, and carries an HARQ ACK / NACK signal, which is a response of an uplink transmission. A physical uplink control channel (PUCCH) carries uplink control information such as an HARQ ACK / NACK signal for downlink transmission, a scheduling request, and a CQI. A physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH). A physical random access channel (PRACH) carries a random access preamble.

The frame consists of 10 subframes. The subframe includes a plurality of OFDM symbols. The carrier may have its own control channel (e.g., PDCCH).

The element carrier may be divided into a primary component carrier (PCC) and a secondary component carrier (SCC). The terminal may use only one major carrier or use one or more sub-carrier with carrier. A terminal may be allocated a primary carrier and / or secondary carrier from a base station.

The primary serving cell may be a security input and a non-access stratum (NAS) in an RRC connection establishment or re-establishment or re-establishment state, Refers to one serving cell that provides mobility information. Depending on the capabilities of the terminal, at least one cell may be configured to form a set of serving cells together with a main serving cell, said at least one cell being referred to as a secondary serving cell.

Therefore, the set of serving cells set for one UE may consist of only one main serving cell, or may consist of one main serving cell and at least one secondary serving cell.

The downlink component carrier corresponding to the main serving cell is referred to as a downlink principal carrier (DL PCC), and the uplink component carrier corresponding to the main serving cell is referred to as an uplink principal carrier (UL PCC). In the downlink, the element carrier corresponding to the secondary serving cell is referred to as a downlink sub-element carrier (DL SCC), and in the uplink, an elementary carrier corresponding to the secondary serving cell is referred to as an uplink sub-element carrier (UL SCC) do. Only one DL serving carrier may correspond to one serving cell, and DL CC and UL CC may correspond to each other.

Therefore, the communication between the terminal and the base station in the carrier system is performed through the DL CC or the UL CC, which is equivalent to the communication between the terminal and the base station through the serving cell. For example, in the method of performing random access according to the present invention, a UE transmits a preamble using UL CC is equivalent to transmitting a preamble using a main serving cell or a secondary serving cell. In addition, receiving a downlink information using a DL CC by a UE can be regarded as equivalent to receiving downlink information using a main serving cell or a secondary serving cell.

On the other hand, the main serving cell and the secondary serving cell have the following characteristics.

First, the main serving cell is used for transmission of the PUCCH. On the other hand, the secondary serving cell can not transmit the PUCCH, but some of the information in the PUCCH can be transmitted through the PUSCH.

Second, the main serving cell is always activated, while the secondary serving cell is a carrier that is activated / deactivated according to certain conditions. The specific condition may be a case where an activation / deactivation indicator of the base station is received or an inactivation timer in the terminal expires. Activation means that the transmission or reception of traffic data is performed or is in a ready state. Deactivation means that transmission or reception of traffic data is impossible and measurement or transmission / reception of minimum information is possible.

Third, the main serving cell is composed of DL PCC and UL PCC in a pair.

Fourth, a different CC may be set as a main serving cell for each terminal.

Fifth, a secondary serving cell in which a PUCCH to be set in the primary serving cell can be defined as a special secondary serving cell. Or a secondary serving cell in which a contention based random access procedure can be set as a special secondary serving cell. Or a secondary serving cell in which both of the above two functions can be defined as a special secondary serving cell. The PUCCH may be defined later for the specific sub-serving cell because the special-sub-serving cell may be defined for a specific sub-serving cell, so that Type 1 redundant power information and Type 2 redundant power information for the special- The forms involved can also be considered.

Sixth, the PUCCH or contention-based random access procedure for the special-part serving cell may be fixedly set in the configuration of the special-purpose serving cell, or may be set by RRC signaling (RRC reconfiguration message) when the base station reconfigures the secondary serving cell Allocated (configured) or released. The PUCCH for the special-purpose serving cell may include ACK / NACK information or CQI (channel quality information) of the serving cells in the specific group constituted by the RRC signaling. Where the particular group may be a secondary Timing Alignment Group (sTAG) or may be a subordinate Timing Alignment Group (sTAG) or a subordinate Timing Alignment Group (sTAG) included in a particular base station (e. G., A macro base station comprising only macro cells or a small base station including only small cells) It may also be a group of cells.

Seventh, the base station may construct a special secondary serving cell of one of a plurality of secondary serving cells in the specific group, or may not constitute a special secondary serving cell. The reason for not configuring the special-purpose serving cell is that it is determined that a contention-based random access procedure or PUCCH need not be set for the particular group. For example, it may be necessary to determine that a contention-based random access procedure does not need to be performed in any of the serving cells in the particular group, or to determine that the capacity of the current serving cell's PUCCH is sufficient and to set the PUCCH for additional serving cells This is the case without.

The technical idea of the present invention regarding the characteristics of the main serving cell and the secondary serving cell is not necessarily limited to the above description, but is merely an example and may include more examples.

In a wireless communication environment, a propagation delay may be experienced while a radio wave propagates in a transmitter and is transmitted in a receiver. Therefore, even if the transmitter and the receiver both know the time at which the radio wave is propagated correctly, the arrival time of the signal to the receiver is influenced by the transmission / reception period distance and the surrounding propagation environment. If the receiver does not know exactly when the signal transmitted by the transmitter is received, it will receive the distorted signal even if it fails to receive or receive the signal.

Therefore, in the wireless communication system, synchronization between the base station and the terminal must be predetermined in order to receive the information signal regardless of the downlink / uplink. Types of synchronization include frame synchronization, information symbol synchronization, and sampling period synchronization. Here, the sampling period synchronization is the most basic synchronization to be obtained in order to distinguish the physical signals.

In case of uplink, the base station receives signals transmitted from a plurality of terminals. When the distance between each terminal and the base station is different, signals received by each base station have different transmission delay times. When uplink information is transmitted based on downlink synchronization acquired by each terminal, And is received at the corresponding base station. In this case, the base station can not acquire synchronization based on any one of the terminals. Therefore, uplink synchronization acquisition requires a procedure different from downlink.

A random access procedure is performed to acquire the uplink synchronization of the UE. During the random access procedure, the UE generates uplink synchronization based on a timing alignment value (TA value) . In order to advance the uplink time, the time alignment value may be referred to as a timing advance value.

Meanwhile, in a multi-carrier system, one terminal communicates with a base station via a plurality of element carriers or a plurality of serving cells. If all the signals of the plurality of serving cells set in the UE have the same time delay, the UE can acquire uplink synchronization for all the serving cells with only one time alignment value. On the other hand, if the signals of the plurality of serving cells have different time delays, a different time alignment value is required for each serving cell. That is, multiple timing alignment values are required. If the UE performs random access to each serving cell in order to obtain multi-time alignment values, overhead occurs in the limited uplink resources, and the complexity of the random access may increase. A timing alignment group (TAG) is defined to reduce this overhead and complexity.

The time alignment group may include a main serving cell, may include at least one secondary serving cell, and may include a primary serving cell and at least one secondary serving cell.

Now, the power headroom (PH) will be described.

The surplus power means an extra power that can be additionally used in addition to the power that the present terminal uses for uplink transmission. For example, suppose that the maximum transmission power, which is the uplink transmission power in the allowable range of the terminal, is 10W, and the current terminal uses 9W of power in the frequency band of 10Mhz. At this time, since the terminal can additionally use 1W, the surplus power becomes 1W.

Here, if the base station allocates a frequency band of 20 MHz to the terminal, 18 W (= 9 W 2) of power is required. However, since the maximum power of the UE is 10W, if the UE allocates 20Mhz, the UE can not use all of the frequency bands, or the UE can not properly receive signals of the UE due to insufficient power. In order to solve this problem, the terminal reports to the base station that the surplus power is 1 W, and allows the base station to perform scheduling within the surplus power range. This report is called the Power Headroom Report (PHR).

(1) information on the difference between the maximum transmission power of a nominal terminal and the estimated UL-SCH (PUSCH) transmission power for each activated serving cell, (2) Information on the difference between the maximum transmit power of the UE and the predicted PUCCH transmit power or 3) information on the difference between the maximum transmit power scheduled in the main serving cell and the predicted UL-SCH and PUCCH transmit power may be transmitted to the serving BS have.

The terminal's surplus power report can be defined as two types (Type 1, Type 2). The residue power of an arbitrary terminal may be defined for subframe i for serving cell c.

<1. Type 1 (Type 1 surplus power) of surplus power report>

Type 1 redundant power may occur when the UE transmits 1) only the PUSCH without the PUCCH, 2) transmits the PUCCH and PUSCH simultaneously, and 3) the PUSCH is not transmitted.

First, if a UE transmits a PUSCH without a PUCCH for a subframe i for a serving cell c, the residual power for the Type 1 report is given by the following equation.

을 데시벨 값[dB]으로 변환한 값이다. Where P _{CMAX , c} (i) is the maximum terminal transmit power configured for the serving cell c

To the decibel value [dB].

Here, P _CMAX (i) is determined by a P _EMAX value set based on P-max, which is a value that the base station transmits to the UE through RRC signaling, and a transmission power class determined by the hardware level of each UE P _PowerClass value based on the maximum transmission power value set based on a small value of the power of the terminal. The offset values may include a maximum power reduction (MPR), an additional maximum power reduction (A-MPR), a power management maximum power reduction (P-MPR) And an offset value? T _C applied according to whether the band of the filter in the transmission part of the terminal is high or not can be applied.

Unlike P _CMAX (i) _, P _{CMAX , c} (i) is a value limited to the serving cell c. Accordingly, the P-max value is also a value (P _{EMAX , c} ) configured for the serving cell c, and the offset values are also calculated to be a value configured only for the serving cell c. That is, MPR _c , A-MPR _c , P-MPR _c , and ΔT _{C, c} . However, the P _PowerClass value is calculated by using the same value as the value used in the terminal unit calculation.

Also, M _{PUSCH , c} (i) is a value expressed by the number of RBs in the bandwidth of the resource to which the PUSCH is allocated in the subframe i for the serving cell c.

In addition, P _{O _ PUSCH , c} (j) is the sum of P _{O _ NOMINAL _ PUSCH , c} (j) and P _{O _ UE _ PUSCH , c} (j) for the serving cell c, 0 or 1. J is 0 for semi-persistent grant PUSCH transmission (or retransmission) whereas j is 1 for dynamic scheduled grant PUSCH transmission (or retransmission), while random access response grant PUSCH transmission (Or retransmission), j is 2. In the case where the random access response grant PUSCH transmission (or _{retransmission) P O _ UE _ PUSCH,} c (2) = 0 , and, P _{O _ NOMINAL _ PUSCH, c} (2) is P _{O _ PRE} and Δ _{PREAMBLE _ Msg3} the sum of a, in which the parameter P _{O_PRE} (preambleInitialReceivedTargetPower) and Δ _{PREAMBLE _ Msg3} is signaled from higher layers.

If j is 0 or 1, one of the values α _c ∈ {0, 0, 4, 0.5, 0.6, 0.7, 0.8, 0.9, 1} may be selected by the 3-bit parameter provided in the upper layer. When j is 2, α _c (j) = 1 at all times.

PL _c is the dB value of the estimated downlink path loss (PL, or path attenuation or path attenuation) for the serving cell c calculated at the UE, and can be obtained from "referenceSignalPower - higher layer filtered RSRP". Here, referenceSignalPower is a value provided in the upper layer, and is a unit of dBm of the EPRE (Energy Per Resource Element) value of the DL reference signal. Reference Signal Received Power (RSRP) is the received power value of the reference signal for the reference serving cell. The decision of the serving cell selected as the reference serving cell and the referenceSignalPower and the higher layer filtered RSRP used for the calculation of the PL _c is made by the upper layer parameter pathlossReferenceLinking. Here, the reference serving cell formed by the pathlossReferenceLinking may be the DL serving cell of the serving cell or the serving serving cell connected to the UL CC and the SIB2 connection.

이다. 여기서, K_s는 각 서빙셀 c에 대하여 상위계층에서 deltaMCS-Enabled으로 제공되는 파라미터이며 1.25 또는 0이며, 특히, 전송 다이버시티(Transmit diversity)를 위한 모드인 전송 모드2(transmission mode 2)인 경우 K_s는 언제나 0이다. 또한, UL-SCH 데이터 없이 PUSCH를 통해 제어정보만이 전송되는 경우 BPRE=O_CQI/N_RE이고, 그 밖의 경우

인데, C는 코드블록의 개수이며, K_r은 코드블록의 크기이며, O_CQI는 CRC 비트수를 포함한 CQI/PMI 비트 개수이며, N_RE는 결정된 자원 요소(Resource Element)들의 개수(즉,

)이다. 또한, 만일 PUSCH를 통해 UL-SCH 데이터 없이 제어정보만이 전송되는 경우 "

"로 설정하고, 그 이외의 경우는 β^PUSCH _offset는 항상 1로 설정한다.Further,? _{TF , c} (i) is a parameter for reflecting an influence by a modulation coding scheme (MCS)

to be. Here, K _s is a parameter provided as deltaMCS-Enabled in the upper layer for each serving cell c and is 1.25 or 0. In particular, in the case of transmission mode 2, which is a mode for transmit diversity K _s is always zero. Also, when only control information is transmitted through the PUSCH without UL-SCH data, BPRE = O _CQI / N _RE , and in other cases

Inde, C is the number of code blocks, K _r is the size of the code block, O _CQI is CQI / PMI bit number including the number of CRC bits, N _RE is the number of the determined resource element (Resource Element) (i.e.,

)to be. Also, if only control information is transmitted without UL-SCH data through the PUSCH,

", Otherwise, β ^PUSCH _offset is always set to" 1 ".

Also, δ _{PUSCH , c} is a correction value, which is a TPC command (TPC command) existing in DCI format 0 or DCI format 4 for the serving cell c, or DCI format 3 / 3A. &Lt; / RTI &gt; In the DCI format 3 / 3A, the CRC parity bits are scrambled with the TPC-PUSCH-RNTI so that only the UEs to which the RNTI value is assigned can be checked. Herein, when the RNTI value is configured by a plurality of serving cells, a different RNTI value may be allocated to each serving cell in order to distinguish each serving cell. At this time, the PUSCH power control adjustment state for the current serving cell c is given by f _c (i), or when the accumulation is activated by the upper layer with respect to the serving cell c or when the TPC command 隆_{PUSCH ,} If the DCI format 0 scrambled by a Temporary) -C-RNTI is included in the PDCCH is _{"f c (i) = f} c (i-1) + δ PUSCH, c (iK PUSCH)". Where δ _{PUSCH , c} (iK _PUSCH ) is the TPC command in the DCI format 0/4 or 3 / 3A in the PDCCH that was transmitted in the (iK _PUSCH ) th subframe and f _c (0) is the first value after the cumulative reset . In addition, the K _PUSCH value is 4 in the case of FDD. If there is a PDCCH scheduling PUSCH transmission in subframe 2 or 7 in the TDD UL / DL setting 0, if the LSB (Least Significant Bit) value of the UL index is set to 1 in the DCI format 0/4 in the PDCCH K _PUSCH is 7.

Second, if the UE simultaneously transmits PUCCH and PUSCH for subframe i for serving cell c, the type 1 redundant power is expressed by the following equation.

은 서브프레임 i 에서 PUSCH전송만이 있다고 가정하에 계산된 값이다. 이 경우, 물리계층은 P_{CMAX ,c}(i)대신에

을 상위계층에 전달한다.here,

Is a value calculated on the assumption that there is only PUSCH transmission in subframe i. In this case, the physical layer is replaced by P _{CMAX , c} (i)

To the upper layer.

Third, if the PUSCH is not transmitted for the subframe i for the serving cell c, the type 1 residue power is expressed by the following equation.

는 MPR는 0dB, A-MPR는 0dB, P-MPR은 0dB, 및 ΔT_C는 0dB임을 가정하고 계산된다.here,

The MPR is 0dB, A-MPR is 0dB, P-MPR is 0dB, and _C ΔT is calculated assuming that the 0dB.

<2. Type 2 of surplus power report (Type 2 surplus power)>

The Type 2 redundant power is used when the UE transmits PUCCH and PUSCH for subframe i for the main serving cell at the same time, transmits PUSCH without PUCCH, transmits PUCCH without PUSCH, and does not transmit PUCCH or PUSCH There is a case.

First, if the UE simultaneously transmits PUCCH and PUSCH for subframe i for the main serving cell, the Type 2 redundant power is calculated according to the following equation.

Here, Δ _{F_ PUCCH} (F) is defined in an upper layer (RRC), each Δ _{F_ PUCCH} (F) value corresponds to the associated PUCCH format (F) and the PUCCH formats 1a. Here, each PUCCH format (F) is shown in the following table.

If the terminal is configured for two antenna ports by the upper layer, the value of DELTA _TxD (F ') for each PUCCH format F' is provided in the upper layer. If not, then Δ _TxD (F ') = 0.

Also, h (n _CQI , n _HARQ , n _SR ) has different values for each PUCCH format. Where n _CQI represents the number of bits of CQI (channel quality information) information. Also, if SR (scheduling request) is configured in sub-frame i and no SR configuration exists in any transport block related to the UL-SCH of the UE, n _SR = 1 and n _SR = 0 otherwise. If the UE is set in one serving cell, n _HARQ is the number of HARQ-ACK bits transmitted in subframe i. H (n _CQI , n _HARQ , n _SR ) = 0 for PUCCH format 1 / 1a / 1b. H (n _CQI , n _HARQ , n _SR ) = (n _HARQ -1) / 2 if the UE is set in one or more serving cells for PUCCH format 1b of channel selection, _CQI , n _HARQ , n _SR ) = 0. (N _CQI , n _HARQ , n _SR ) = ₁₀ log ₁₀ (n _CQI / 4) if the n _CQI is equal to or greater than 4 for the PUCCH format 2 / 2a / 2b and the normal cyclic prefix, H (n _CQI , n _HARQ , n _SR ) = 0. PUCCH format 2, and the extended cyclic prefix _{(extended cyclic prefix) "n CQI} + n HARQ" is greater than or equal to 4 with respect to _{h (n CQI, n HARQ,} n SR) = 10log 10 ((n CQI + n HARQ) / 4), and otherwise h (n _CQI , n _HARQ , n _SR ) = 0. For PUCCH Format 3, if the UE is configured to transmit a PUCCH at a 2-antenna port by an upper layer or if the UE is set to transmit 11-bit HARQ-ACK / SR, then h (n _CQI , n _HARQ , n _SR ) = (n _HARQ + n _SR -1) / 3, and otherwise h (n _CQI , n _HARQ , n _SR ) = (n _HARQ + n _SR -1) / 2. P _{O _ PUCCH} is a parameter composed of the sum of P and P parameters _{O_NOMINAL_PUCCH O _ _ UE PUCCH} parameters provided by the higher layers.

Second, if a mobile station transmits a PUSCH without a PUCCH for a subframe i for a main serving cell, the type 2 redundant power is calculated by the following equation.

Third, if the UE transmits a PUCCH without a PUSCH to a subframe i for a main serving cell, the type 2 redundant power is calculated by the following equation.

Fourth, if the UE does not transmit PUCCH or PUSCH for subframe i for the main serving cell, the Type 2 redundant power is calculated as follows.

는 MPR는 0dB, A-MPR는 0dB, P-MPR은 0dB, 및 ΔT_C는 0dB임을 가정하고 계산된다.here,

The MPR is 0dB, A-MPR is 0dB, P-MPR is 0dB, and _C ΔT is calculated assuming that the 0dB.

The residual power value is determined in units of 1 dB and should be determined by rounding to the nearest one of the values in the range of 40 dB to -23 dB. The determined excess power value is transferred from the physical layer to the upper layer.

On the other hand, the reported residual power is an estimated value in one subframe.

If an extended PHR (Extended PHR, hereinafter referred to as extended PHR) is not configured, only Type 1 redundant power values for the main serving cell are reported. On the other hand, if extended surplus power reporting is configured, a Type 1 redundant power value and a Type 2 redundant power value are reported for each active serving cell configured for uplink. The extended surplus power report is described in detail below.

The idle power reporting delay is the difference between the starting point of the idle power reference interval and the point at which the terminal starts transmitting the idle power value through the air interface. The idle power report delay should be 0ms and the idle power report delay can be applied to all configured triggering schemes for the idle power report.

The mapping of reported surplus power can be given as shown in the following table.

Referring to Table 2, the surplus power falls within the range of -23 dB to +40 dB. If 6 bits are used to represent the residue power, 64 (= 2 ⁶ ) kinds of indexes can be represented, and the total power is divided into 64 levels. For example, if the bit representing the redundant power is "0"("000000" if represented by 6 bits), it indicates that the level of the redundant power is "-23≤P _PH ≤ -22 dB".

On the other hand, control of the surplus power report is possible through a periodic surplus power reporting timer (periodicPHR-Timer, hereinafter referred to as a "periodic timer") and a blocking timer (prohibitPHR-Timer). By transmitting the value of "dl-PathlossChange" through the RRC message, a triggering of the surplus power report by the change of the path loss value measured in the downlink by the UE and the change of the power backoff request value (P-MPR) .

The surplus power report may be triggered when at least one of the following events occurs.

For example, after the UE acquires uplink resources for a new transmission and proceeds to the last surplus power report transmission, it calculates a path loss value (for example, If a path loss value (dB) is changed more significantly in at least one active serving cell, where the one pathloss estimate changes more significantly and the blocking timer expires, the blocking timer expires, and is used as a path loss reference, The report is triggered. The path loss estimate may be measured by the terminal based on RSRP.

In another example, when the periodic timer has expired, a surplus power report is triggered. In accordance with the periodic redundant power reporting scheme, the terminal triggers the redundant power report when the periodic timer expires, and restarts the periodic timer when the redundant power is reported, since the redundant power varies from time to time.

As another example, if the configuration or reconfiguration associated with the surplus power reporting operation, except for the use prohibition, is made by a higher layer such as RRC or MAC, the surplus power report is triggered.

As another example, when the serving cell in which the uplink is configured is activated, the surplus power report is triggered.

As another example, if the UE acquires uplink resources for a new transmission, any one of the active serving cells configured in the uplink may transmit the uplink data through the uplink resource or the last surplus power A change in the power backoff request value (P-MPR _c ) after the last power control report transmission, if the resource allocation for the uplink transmission is performed after the report transmission, If the value is greater than the "dl-PathlossChange" [dB] value, the surplus power report is triggered.

As an example of triggering, when a UE is allocated resources for a new transmission for a corresponding TTI, the UE performs the following three steps.

(1) If it is the first uplink resource allocation for a new transmission after the last MAC reset, it starts a periodic timer.

(2) when at least one redundant power report has been triggered since the last redundant power report transmission or when the transmitted redundant power report is the first triggered redundant power report, and the allocated uplink resources are redundant power reporting MAC control elements 1) if an extended PHR is configured, it obtains a Type 1 redundancy power value for each active cell and the uplink is configured, and if the extended PHR is configured, If the uplink resource allocation for the uplink transmission is received in the corresponding TTI, a value corresponding to the P _{CMAX , c} field is obtained from the physical layer _, and the extended PHR MAC ). 2) If the extended PHR is configured and simultaneous PUCCH-PUSCH is configured, a Type 2 redundant power value for the main serving cell is obtained. If the UE transmits a PUCCH to the corresponding TTI, P _{CMAX , c} field, and generates and transmits the extended PHR MAC CE. 3) If the extended PHR is not configured, the Type 1 redundant power value is obtained from the physical layer, and the redundant power reporting MAC control element is generated and transmitted.

(3) The terminal starts or restarts the periodic timer, starts or restarts the blocking timer, and cancels all triggered surplus power reports.

Meanwhile, the extended PHR MAC CE is identified by the LCID in the subheader of the MAC PDU. The extended PHR MAC CE can have various sizes.

Now, we describe dual connectivity in a small cell.

A terminal can receive a service through different frequency bands from a small base station including only at least one small cell and a macro base station including at least one macro cell. This is also called a dual connection of the terminal. A base station with low transmission power, such as a small base station, is also referred to as a low power node (LPN).

When a frequency resource is allocated to a base station, a base station including a small cell (hereinafter, referred to as a small base station) and a base station including a macro cell (hereinafter referred to as a macro base station) The small base station uses the F1 frequency band and the macro base station uses the F2 frequency band) or the small base station and the macro base station use the same frequency band.

2 shows an example of a dual connection situation of a terminal applied to the present invention.

Referring to FIG. 2, the F2 frequency band is allocated to the macro base station, and the F1 frequency band is allocated to the small base station. The terminal receives the service from the macro base station through the frequency band F2 and receives the service from the small base station through the frequency band F1.

In this manner, when a terminal is dual-connected between a small cell and a macro cell, a method is proposed in which the terminal simultaneously establishes connection with a small cell and a macro cell or operates a connection.

In a wireless communication system (e.g., an LTE system), a connection setup between a terminal and a cell can be divided into a logical path setup and a wireless connection setup.

The logical path setting is a path setting for data to be transmitted end-to-end. For example, EPS Bearer configuration, Radio Bearer configuration, and so on.

The logical path setting may not include a wireless connection setting, or may include settings for some or all of the wireless connection settings.

The wireless connection setting is a series of settings necessary for transmitting and receiving actual wireless communication data. For example, system information setting, PHY / MAC parameter setting, RRC connection setting, and so on.

The present invention proposes a method of operating a PHR in each possible wireless connection scheme in a situation where a dual connection between a macro cell and a small cell and a terminal is configured.

The logical path setting in the present invention will be described below with reference to FIGS. 3 to 4, for example. However, the present invention is not limited thereto. The description of the macro cell and the description of the small cell can be changed.

For example, the upper layer (e.g., the RLC / PDCP layer) configured for data service for the MS may exist only in one base station depending on a base station including a macro cell or a small cell, And exist in each base station, but can be connected to each other by a cooperative relationship or a master relationship.

3 is an example of a case where a terminal establishes a dual connection with a small base station and a macro base station.

Referring to FIG. 3, the macro base station includes the PDCP, RLC, MAC, and PHY layers, while the small base station includes the RLC, MAC, and PHY layers.

The PDCP layer of the macro base station is connected to the RLC layer of the small base station using the Xa interface protocol (Xa interface protocol) through the backhaul. It is also referred to as RAN split because it is separated from the RAN layer. The Xa interface protocol may be an X2 interface protocol defined between base stations in the LTE system.

The terminal receives the service from the small base station using the F1 frequency band as the secondary serving cell, and receives the service from the macro base station using the F2 frequency band as the main serving cell.

In case of RAN split, when the signaling through the backhaul physically connected between the macro base station and the small base station arrives after a relatively large delay time (e.g., 25 ms to 60 ms), the macro base station may become the scheduler for the mobile station. This is because in a wireless communication system designed for high-speed transmission such as the current LTE system, the scheduler must be able to support dynamic resource allocation in a very short time unit (e.g., 1 ms).

At this time, due to the delay time of the signaling through the backhaul, the performance degradation may occur due to the difference between the generation time of the scheduling information for the dynamic resource allocation and the actual application time of the small base station in which the scheduler does not exist. Therefore, a separate scheduler is required for a small base station. This corresponds to case 1 described below.

On the other hand, a control plane such as the RRC layer may exist only in the macro base station because of the validity of the wireless link, security, reliability, handover control, and the like. The scheduler exists only in the macro base station, even if the performance deterioration of the resource efficiency through the small base station is neglected.

In the case of the control information generated by the UE and provided to the scheduler, the UE transmits the uplink transmission including the control information to one BS including the scheduler, (I.e., macro base station). This corresponds to Case 2 or Case 3 described below.

On the other hand, the existence of the scheduler is more closely related to the existence of the RRC layer, apart from the RAN split / CN split. If the RLC layer or higher layer exists in all base stations, it is probable that scheduling for MAC / PHY can basically be performed by a separate scheduler.

FIG. 4 shows another example of a case where a terminal establishes a dual connection with a small base station.

Referring to FIG. 4, the small base station and the macro base station include PDCP, RLC, MAC, and PHY layers, respectively.

The macro base station and the small base station each include a PDCP layer and can schedule uplink transmissions of the UEs, respectively.

A part of a plurality of EPS bearers allocated to a single terminal is also referred to as a CN split because it is separated from the core network.

Now, in the present invention, a method of reporting surplus power of a mobile station in a case where a mobile station is wirelessly connected to two or more different base stations in an uplink will be described.

However, when a mobile station is connected to two or more different base stations through radio links for downlink and uplink, the mobile station transmits a PHR to a corresponding base station connected to the uplink of one of the two or more uplinks through the uplink It is assumed that it can not be done. This is because if a scheduler exists only in one of the two or more different base stations and the backhaul between the base stations has a large delay time (for example, 25 ms to 60 ms), the PHR information may not be good The PHR information can not be shared.

5 is a flowchart showing an example of a procedure for a terminal to report an excess power report according to the present invention. The second BS having the UL MAC layer and the physical layer scheduling right is scheduling the first BS without the UL MAC layer and the physical layer scheduling right.

Referring to FIG. 5, a terminal may trigger a power headroom report (PHR) based on a path loss (PL) change as a triggering reference or a PHR periodic timer as a reference (S500).

In one example, the terminal triggers the PHR on a triggering basis for path loss changes.

Specifically, after transmitting the most recently (or immediately before) the PHR based on the current time, the terminal calculates the path loss value (in days) in at least one active serving cell used as a pathloss reference (PLR) (For example, dB unit) is equal to or larger than a predetermined value (for example, a value set to 'dl-PathlossChange') and the PHR blocking timer (for example, prohibit PHR-Timer) has expired or the PHR blocking timer has expired And triggers the PHR when the situation occurs.

Here, PLR means DL CC as a criterion for measuring the RSRP value to calculate the path loss. By setting PLR, it is possible to select DL CC which is more suitable for uplink control. This is related to the deployment situation.

For example, in the case of different DL CCs defined in the same frequency band, if the DL CCs are all transmitted from the same base station, the path loss for each DL CC will be almost similar. However, if the DL CCs are transmitted through a base station or an RRH existing in different physical locations, the path loss for each DL CC will be different. Therefore, the UL CC can set the path loss reference to measure the path loss differently according to the base station targeted by the UL CC.

6 shows an example of a terminal triggering a PHR based on a change in path loss value.

6, the path loss value (M, 605) of the secondary serving cell is smaller than the predetermined threshold value (dl-PathlossChange), but the path loss value (K, 610) of the main serving cell is smaller than the predetermined threshold value dl -PathlossChange), the terminal triggers the PHR if the PHR blocking timer has expired.

At this time, the serving cells (i.e., the main serving cell or the secondary serving cell) for which the path loss value is calculated are one of the serving cells existing in the macro base station or the small base station. The PLR of the sTAG inner serving cell is the DL CC of the serving serving cell itself. The PLR of the pTAG inner serving cell is the DL CC of the serving serving cell itself or the DL CC of the serving serving cell, and which CC can be determined through RRC signaling.

7 is a view for explaining an example of a PLR setting applied to the present invention.

Referring to FIG. 7, the PLR of SCell2, which is the sTAG1 internal serving cell, is its DL CC 705. Also, the PLR of SCell1 in the pTAG is its own DL CC 710 or PCell's DL CC 715.

The PHR blocking timer may be configured on a terminal-by-terminal basis or on a per-base-station basis. When configured based on a base station, it may be configured as a PHR blocking timer.

8 is a view for explaining an example of the PHR blocking timer setting.

Referring to FIG. 8, a first PHR blocking timer (Prohibit timer 1 800) is configured for a macro base station, and a second PHR blocking timer (Prohibit timer 2, 805) is configured for a small base station. The first PHR blocking timer is configured for uplink transmission of the main time forward group (pTAG) and the sub time forward group (sTAG1) included in the macro base station, the second PHR blocking timer is configured for the sub time forward group (sTAG2) For uplink transmission. In addition, a PHR blocking timer may be configured for each serving cell. The PHR blocking timer in each serving cell starts the timer operation when the PHR for the serving cell is configured and transmitted. For example, when the PHR containing the PH related information for the primary serving cell and the secondary serving cell 1 is transmitted, the timer configured in the primary serving cell and the secondary serving cell 1 starts at the same time. However, in the case of the auxiliary serving cell 2 not included in the PHR, the timer is not started.

On the other hand, in another example of the PHR triggering criteria of step S500, the terminal triggers the PHR when the PHR periodic timer expires.

At this time, the PHR periodic timer may be configured on a terminal-by-terminal basis or on a per-base-station basis. Alternatively, the PHR periodic timer may be configured the same as the PHR blocking timer of FIG.

In step S500, if the UE has actual uplink transmission to the second base station in which the scheduler does not exist, the UE generates PH _{, c} and P _{CMAX , c} values based on the PHR transmission condition within a transmission interval allocated to the uplink And stores the PHR value (hereinafter referred to as delayed PHR) that has not been transmitted in the terminal without transmitting the PHR value (S505). At this time, the PHR triggering occurrence state is maintained.

 Following step S505, if the PHR transmission criterion is satisfied, the terminal transmits the delayed PHR through the uplink connected to the second base station (S510). That is, if an uplink resource for transmitting a PHR for a first base station in which a scheduler does not exist is secured in an interval in which uplink transmission to a second base station in which a scheduler exists, a PHR for the first base station is transmitted . Alternatively, when a PHR is triggered in serving cells in a base station connected through an uplink, if a first uplink grant capable of transmitting both the PHR and the delayed PHR is received, the delayed PHR is transmitted through the uplink .

For example, in the case of TDM, the UE transmits information on how long the delayed PHR is transmitted (hereinafter referred to as PHR delay information) to the second base station together with the delayed PHR or separately. Since the UE can perform uplink transmission only to one base station at a moment, it performs uplink transmission to one of the first base station and the second base station through switching. In the uplink transmission to the second base station, the PHR Lt; / RTI &gt; In this case, the second base station may be a macro base station, the first base station may be a small base station, and the PDCP layer of the second base station may be connected to the RLC layer of the first base station through an Xa interface protocol through a backhaul, RAN Split.

At this time, the PHR delay information may be configured in units of subframes. Alternatively, the PHR delay information may be transmitted through two bits (fields set to R bits) before the PH field in the PHR MAC CE. Alternatively, the PHR delay information may be transmitted using an 8-bit indicator (1 octet) included in the PHR MAC CE. Alternatively, the PHR delay information may be transmitted through a PHR MAC CE format for a delayed PHR, and an LCID index indicating that a delayed PHR is included in the PHR MAC CE format for the delayed PHR may be set. 16 to 21 will be described in detail below.

As another example, when the TA value for the first base station is different from the TA value for the second base station (that is, when the TA value is different between the macro cell and the small cell), pTAG and sTAG, Can be assumed. That is, the MS stores the PHR for the sTAG and transmits the pTAG together when the uplink for the pTAG is triggered. This can also be applied when the PHR for the sTAG is transmitted at the same time without delay, and the PHR delay information can be selectively transmitted.

That is, the second base station may be defined as a base station in which a main serving cell exists, or may be recognized as a serving cell included in the same base station as the base station, only with respect to secondary serving cells belonging to the same TAG (Timing Advance Group) . The TAG of the main serving cell is referred to as pTAG.

Alternatively, the second base station may be defined as a base station having a secondary serving cell (also referred to as a Special Cell) serving as a main serving cell, or may be defined as the same as the base station only for secondary serving cells belonging to the same TAG as the Special Cell It can be recognized as a serving cell included in the base station. The TAG of the special cell is one of the sTAGs.

In the meantime, the 'PHR transmission reference' refers to the PH, c (i.e., PH for c in the serving cell) for all activated serving cells in the same TTI for the serving cells corresponding to each base station, And an extended PHR MAC CE that includes both P _{CMAX , c} (i.e., P _CMAX for serving cell c). If the PHR transmission criterion is satisfied, the terminal transmits PHR.

Following step S510, the second base station may forward the scheduling information for the terminal to the first base station (S515).

For example, in the case of the RAN split shown in FIG. 3, the PDCP layer of the second base station is connected to the RLC layer of the first base station through the Xa interface protocol, and can transmit the scheduling information.

Figures 9-15 illustrate a specific embodiment for transmitting a delayed PHR in accordance with the present invention. When the UE receives the initial uplink grant from which the delayed PHR can be transmitted from the base station, the delayed PHR is transmitted based on the uplink grant.

Hereinafter, a serving frequency of the serving cells of the first base station in which the scheduler is not present for the serving cells is denoted by F1, and a serving frequency of the serving cells of the second base station in which the scheduler exists is denoted by F2.

FIG. 9 shows an example of a case in which the UE transmits a delayed PHR for F1 to the second base station regardless of the PHR for F2 in case of TDM.

Referring to FIG. 9, the PHR for F1 in subframe # 1 900 is triggered but is not transmitted through PUSCH in subframe # 2 (905).

A delayed PHR (PHR for F1) that can not be transmitted in the subframe # 2 is configured and stored in the UE, and the delayed PHR 950 is transmitted through the PUSCH in the subframe # 8 (910), which is six subframes . At this time, the subframe # 8 910 corresponds to the uplink resource initially set by the second base station after the delayed PHR is transmitted.

At this time, PHR delay information indicating "6 sub-frames delayed" may be transmitted together with the delayed PHR for F1 or separately.

10 shows an example in which the UE transmits a delayed PHR for F1 regardless of the PHR for F2 in the aggregation of carriers between the base stations. The PUSCH for F2 is transmitted before the PUSCH transmission for F1.

Referring to FIG. 10, after PHR for F1 is triggered in subframe # 1 (1000) of an uplink radio frame for F1, subframe # 3 (1010) of uplink radio frame for F2 is transmitted through PUSCH PHR (delayed PHR, 1050) for F1 is transmitted. The subframe # 3 1010 is an uplink resource initially set in the second macro base station after the PHR for F1 is triggered. Accordingly, since the transmission of the PHR is not required even though the uplink resource is allocated (since the PHR for the F1 has already been transmitted), the subframe # 4 1005 of the uplink radio frame for the F1 does not transmit the PHR.

PHR for F2 is triggered in subframe # 7 1015 of the uplink radio frame for F2 and PHR 1055 for F2 in subframe # 8 1020 is transmitted via PUSCH.

In this case, for example, when the PHR for F1 is transmitted in subframe # 3 1010 of the radio frame for F2 or the PHR for F2 is transmitted in subframe # 8 (1020), the PHRs for F1 and F2 are both One extended PHR MAC CE format as shown in FIG. 17 or FIG. 19 may be used.

As another example, both the delayed PHR MAC CE for F1 and the extended PHR MAC CE for F2 can be transmitted over the serving cell in the F2 band.

On the other hand, PHR delay information indicating "two subframes are delayed" may be transmitted with or separately from the delayed PHR for F1.

11 shows another example in which the mobile station transmits a delayed PHR for F1 regardless of the PHR for F2 in the aggregation of carriers between the base stations.

Referring to FIG. 11, after PHR for F1 is triggered in subframe # 1 1100 of an uplink radio frame for F1, subframe # 1110 3 of uplink radio frame for F2 is transmitted through PUSCH PHR (delayed PHR, 1150) for F1 is transmitted. The subframe # 3 1110 is an uplink resource initially set in the second base station after the PHR for F1 is triggered.

Therefore, since the transmission of the PHR is not required even if the uplink resource is allocated to the subframe # 3 1105 of the uplink radio frame for the F1 (since the PHR delayed in the radio frame for F1 is transmitted), the PHR is not transmitted.

PHR for F2 is triggered in subframe # 7 1115 of the uplink radio frame for F2 and PHR 1155 for F2 in subframe # 8 1120 is transmitted via PUSCH.

On the other hand, PHR delay information indicating "not delayed " may be transmitted with or separately from the delayed PHR for F1.

12 shows another example in which, in carrier aggregation between base stations, the UE transmits a delayed PHR for F1 regardless of the PHR for F2.

Referring to FIG. 12, after the PHR for F1 in the subframe # 1 1200 of the uplink radio frame for F1 is triggered, the PHR is transmitted through the PUSCH in the subframe # 4 1210 of the uplink radio frame for F2 PHR (delayed PHR, 1250) for F1 is transmitted. The subframe # 4 1210 is an uplink resource initially set in the second base station after the PHR for F1 is triggered.

Therefore, even if an uplink resource (e.g., PUSCH resource) is allocated in the subframe # 2 1205 of the uplink radio frame for F1, no PHR is transmitted because there is no scheduler in the first base station.

PHR for F2 is triggered in subframe # 7 (1215) of the uplink radio frame for F2, and PHR 1255 for F2 in subframe # 8 (1220) is transmitted on the PUSCH.

In this case, for example, when the PHR for F1 is transmitted in subframe # 4 of the radio frame for F2 or the PHR for F2 is transmitted in subframe # 8, FIG. 17 or FIG. One extended PHR MAC CE format such as 19 may be used.

As another example, both the delayed PHR MAC CE for F1 and the extended PHR MAC CE for F2 can be transmitted over the serving cell in the F2 band.

On the other hand, PHR delay information indicating "two server frames are delayed" may be transmitted together with or separately from the delayed PHR for F1.

13 shows another example in which, in the aggregation of carriers between the base stations, the UE transmits a delayed PHR for F1 regardless of the PHR for F2.

Referring to FIG. 13, after PHR for F1 is triggered in subframe # 1 (1300) of uplink radio frame for F1, subframe # 13 (1310) of uplink radio frame for F2 is transmitted through PUSCH PHR (delayed PHR, 1350) for F1 is transmitted. The subframe # 4 1310 is an uplink resource initially set in the second base station after the PHR for F1 is triggered.

Therefore, even if a plurality of uplink transmissions (e.g., PUSCH resources) exist in subframe # 2 1302, subframe # 3 1304, and subframe # 4 1306 of the uplink radio frame for F1, PHR is not transmitted because there is no scheduler in the base station. At this time, the PHR finally stored in the UE is the PHR for the most recent subframe among a plurality of uplink transmissions (i.e., subframe # 4 1306). Then, the PHR for the subframe # 4 1306 is transmitted through the subframe # 4 1310 of the uplink radio frame for F2.

That is, the PHR for the PUSCH transmission for the F1 band that is most recently generated before the transmission of the PUSCH that can be transmitted in the radio frame for F2 is finally stored in the terminal.

In this case, when a PHR is triggered among the serving cells in the base station connected through the uplink, if a first uplink grant capable of transmitting both the PHR and the delayed PHR is received, the delayed PHR is transmitted through the uplink .

PHR for F2 is triggered in subframe # 7 1315 of the uplink radio frame for F2 and PHR 1355 for F2 in subframe # 8 1320 is transmitted via PUSCH.

On the other hand, PHR delay information indicating "not delayed " may be transmitted with or separately from the delayed PHR for F1.

Figure 14 shows an example of simultaneous transmission of delayed PHR for F1 and PHR for F2 in TDM.

14, after the PHR for F1 in subframe # 1 1400 of the uplink radio frame is triggered and the PHR for F2 is triggered in subframe # 7 1415, subframe # 8 1420, PHR (delayed PHR) for F 1 and PHR for F 2 are transmitted together (1450) via PUSCH. The subframe # 8 1420 is an uplink resource initially set at the second base station after the PHR for F2 is triggered.

PHR is not transmitted even if uplink transmission (e.g., PUSCH transmission) exists in subframe # 2 1405 and subframe # 6 1410 of the uplink radio frame in order to transmit the PHR for F1 and F2 together .

At this time, one extended PHR MAC CE format such as FIG. 17 or FIG. 19 including both PHRs for F 1 and F 2 can be used.

On the other hand, PHR delay information indicating "6 server frames delayed" can be transmitted together with or separately from the delayed PHR for F1.

15 shows an example of simultaneous transmission of delayed PHR for F1 and PHR for F2 in carrier aggregation between base stations.

Referring to FIG. 15, the PHR for F 1 is triggered in subframe # 1 1500 of the uplink radio frame for F 1, and the PHR for F 2 in subframe # 7 (1515) of the uplink radio frame for F 2 is After triggering, the PHR (delayed PHR) for F1 and the PHR for F2 are transmitted (1550) on the PUSCH in subframe # 8 (1520) of the uplink radio frame for F2. The subframe # 8 1520 is an uplink resource initially set in the second base station after the PHR for F2 is triggered.

Therefore, even if uplink transmission (e.g., PUSCH transmission) exists in subframe # 4 1505 of the uplink radio frame for F1 and subframe # 3 1510 of the uplink radio frame for F2, PHR is not transmitted Do not.

At this time, one extended PHR MAC CE format such as FIG. 17 or FIG. 19 including both PHRs for F 1 and F 2 can be used.

On the other hand, PHR delay information indicating "four server frames delayed" can be transmitted together with the delayed PHR for F1 or separately.

Figures 16-21 illustrate an example of a PHR MAC CE that includes a delayed PHR in accordance with the present invention

FIG. 16 shows an example of a media access control element (MAC) control element of a PHR transmitted from a terminal to a base station according to the present invention. For example, the MAC CE of the PHR may be an extended PHR MAC CE.

Referring to FIG. 16, the PHR MAC CE may include PH _{, c,} and P _{CMAX , c} information for all activated serving cells in the base station for a delayed PHR. In the serving cells in which the actual transmission power is not allocated at the time when the PHR is activated, P _{CMAX , c} information is not included in the delayed PHR, and PH _{and c} values are virtual PH .

The 'C _i ' field indicates a secondary cell index (SCell Index) 'i'. When the C _i field is '1', the PH value is reported in the corresponding serving cell. It means that the PH value is not reported in the serving cell.

Meanwhile, 'C ₀ Field 1600 'may be set to an index corresponding to the main serving cell to indicate that "PH, c" and "P _CMAX , c" for the main serving cell are included. That is, the C ₀ field 1600 serves as an indication to indicate whether the transmitted PHR MAC CE is for the scheduler including the main serving cell.

The 'V' field is an indicator indicating whether the PH value is based on the actual transmission or the PH value for the reference format. In case of type 1 surplus report, it indicates that there is an actual PUSCH transmission if 'V = 0', and indicates that the PUSCH reference format is used if 'V = 1'. In case of Type 2 redundancy report, if 'V = 0', it indicates that there is an actual PUCCH transmission, and 'V = 1' indicates that a PUCCH reference format is used. V = 0 &quot; indicates that the related P _CMAX , c field exists, and if 'V = 1' indicates that the related P _CMAX , c field is omitted, for Type 1 redundancy report and Type 2 redundancy report.

The 'PH' field is a field for the residue power value and may be 6 bits.

In addition, the P field indicates whether or not the UE has applied power back-off (P-MPR) by power management. For example, if the value of the field P _CMAX , c is different due to the power backoff, 1 &quot;.

를 지시하며, 이 필드 값은 존재할 수도 있고 존재하지 않을 수도 있다.Also, P _CMAX , the c field is the P _CMAX , c, or

, And this field value may or may not be present.

17 shows another example of a PHR MAC CE control element transmitted by the terminal to the base station according to the present invention. The PHR MAC CE may be an extended PHR MAC CE.

Referring to FIG. 17, the PHR MAC CE may include both PHR 1700 for F2 and PH $ 1750 for F1. The P _CMAX value of the PHR (delayed PHR) for F1 is transmitted via the 'P _{CMAX .4} field 1755'.

At this time, PHR delay information can be transmitted in the previous two fields 1760 and 1765 of the 'P _{CMAX .4} field 1755'. Since the PHR delay information is 2 bits, it can indicate a value from 0 to 3. The PHR delay information may be a unit of a subframe.

18 shows another example of a PHR MAC CE control element transmitted by a terminal to a base station according to the present invention. The PHR MAC CE may be an extended PHR MAC CE.

Referring to FIG. 18, the PHR MAC CE includes a PHR 1800 for F1. The P _CMAX value of the PHR (delayed PHR) for F1 is transmitted through the 'P _{CMAX .4} field 1805'.

At this time, the PHR delay information can be transmitted in the two previous fields 1810 and 1815 of the 'P _{CMAX .4} field 1805'. Since the PHR delay information is 2 bits, it can indicate a value from 0 to 3. The PHR delay information may be a unit of a subframe.

FIG. 19 shows another example of a PHR MAC CE control element transmitted by a terminal to a base station according to the present invention. The PHR MAC CE may be an extended PHR MAC CE.

Referring to FIG. 19, PHR MAC CE includes PHR 1900 for F2 and PHR 1950 for F1 and 8 bits PHR delay information 1990.

The PHR (delayed PHR) P _CMAX value for F1 is transmitted via the 'P _{CMAX .4} field 1955'.

At this time, it is possible to indicate whether or not the PHR delay information is transmitted in the previous one field (one of 1960 and 1965) of the 'P _{CMAX .4} field 1955', and this can be referred to as "PHR delay information transmission indicator &Quot; indicator &quot;.

Indicates that the delay PHR reporting indicator is "1", "P _{CMAX .4} field (1955), since the 8-bit (1990), the field is PHR delay information. That is, 8 bits of PHR delay information may be included in the PHR MAC CE. The PHR delay information may have a value from 0 to 255, and the unit of PHR delay information may be a sub-frame.

If the PHR delay information transmission indicator is "0 ", it indicates that the last 8 bits (1990) of the PHR MAC CE is not the PHR delay information.

20 shows another example of a PHR MAC CE control element transmitted by a terminal to a base station according to the present invention. The PHR MAC CE may be an extended PHR MAC CE.

Referring to FIG. 20, the PHR MAC CE includes a PHR 2000 for F 1 and 8 bits of PHR delay information 2050.

PHR (Delayed PHR) P _CMAX value for F1 is transmitted through the 'P _{CMAX .4} field 2005'.

At this time, a "PHR delay information transmission indicator" or a "delay PHR indicator" indicating whether or not the PHR delay information is transmitted in the previous one field (one of 2010 and 2015) of the 'P _{CMAX .4} field 2005' .

If the PHR delay information transmission indicator is "1 &quot;, it indicates that the 8-bit (2050) field after the 'P _{CMAX .4} field 2005' is the PHR delay information. That is, 8 bits of PHR delay information may be included in the PHR MAC CE. The PHR delay information may have a value from 0 to 255, and the unit of PHR delay information may be a sub-frame.

If the PHR delay information transmission indicator is "0 ", it indicates that the last 8 bits (2050) of the PHR MAC CE are not PHR delay information.

FIG. 21 shows another example of a PHR MAC CE control element transmitted by a terminal to a base station according to the present invention. The PHR MAC CE may be an extended PHR MAC CE.

21, the PHR MAC CE includes only the delayed PHR (the PHR for F 1, 2100) among the serving cells, and may further include the PHR delay information 2110, and the LCID is set to indicate that the PHR is a delayed PHR do. Such a PHR MAC CE may be referred to as a delayed PHR MAC CE.

Therefore, among the serving cells, the PH _{, c,} and P _{CMAX , c} information that can be transmitted without delay can be configured and transmitted as separate extended PHR MAC CEs.

Table 3 shows an example of the LCID of the delayed PHR MAC CE according to the present invention.

LCID Index LCID values 00000 CCCH 00001-01010 Identity of the logical channel 01011-11000 Reserved 11000 Delayed Power Headroom Report 11001 Extended Power Headroom Report 11010 Power Headroom Report 11011 C-RNTI 11100 Truncated BSR 11101 Short BSR 11110 Long BSR 11111 Padding

Referring to Table 3, if the LCID index is "11000 ", the MAC CE indicates" the delay PHR MAC CE ".

22 is a flowchart showing an example of the operation of the terminal reporting surplus power according to the present invention.

Referring to FIG. 22, the MS is connected to a second BS having an uplink physical layer scheduling right and a first BS having no uplink physical layer scheduling right (S2200).

Subsequently, the terminal sets the path loss change as a triggering reference or triggers the PHR based on the PHR periodic timer (S2200).

In one example, the terminal triggers the PHR on a triggering basis for path loss changes. After transmitting the PHR most recently (or immediately before) based on the current time, the UE determines whether the variation of the path loss value (e.g., in dB) in at least one active serving cell used as a PLR is less than a predetermined value (E.g., a value set to 'dl-PathlossChange') and the PHR blocking timer (e.g., prohibit PHR-Timer) has expired, or when the PHR blocking timer has expired and the situation has occurred .

In another example, the terminal triggers the PHR when the PHR periodic timer expires, wherein the PHR periodic timer may be configured on a per-terminal basis or on a per-base-station basis. Alternatively, the PHR periodic timer may be configured the same as the PHR blocking timer of FIG.

In step S2205, if the UE has an actual uplink transmission to the second base station in which the scheduler does not exist, the UE generates PH _{, c} and P _{CMAX , c} values based on the PHR transmission condition within a transmission interval allocated to the uplink And stores the PHR value (hereinafter referred to as delayed PHR) that has not been transmitted in the terminal without transmitting the PHR value (S2210). At this time, the PHR triggering occurrence state is maintained.

 Following step S2210, if the PHR transmission criterion is satisfied, the terminal transmits the delayed PHR through the uplink connected to the second base station (S2215). That is, if an uplink resource for transmitting a PHR for a first base station in which a scheduler does not exist is secured in an interval in which uplink transmission to a second base station in which a scheduler exists, a PHR for the first base station is transmitted . Alternatively, when a PHR is triggered in serving cells in a base station connected through an uplink, if a first uplink grant capable of transmitting both the PHR and the delayed PHR is received, the delayed PHR is transmitted through the uplink .

For example, in the case of TDM, the UE transmits information on how long the delayed PHR is transmitted (hereinafter referred to as PHR delay information) to the second base station together with the delayed PHR or separately.

At this time, the PHR delay information may be configured in units of subframes. Alternatively, the PHR delay information may be transmitted through two bits (fields set to R bits) before the PH field in the PHR MAC CE. Alternatively, the PHR delay information may be transmitted using an 8-bit indicator (1 octet) included in the PHR MAC CE. Alternatively, the PHR delay information may be transmitted through a PHR MAC CE format for a delayed PHR, and an LCID index indicating that a delayed PHR is included in the PHR MAC CE format for the delayed PHR may be set.

As another example, in cases other than TDM, if the TA value for the first base station is different from the TA value for the second base station (i.e., the TA value is different between the macro cell and the small cell), the terminal determines pTAG It can be assumed to be a macro cell. That is, the MS stores the PHR for the sTAG and transmits the pTAG together when the uplink for the pTAG is triggered. This can also be applied when the PHR for the sTAG is transmitted at the same time without delay, and the PHR delay information can be selectively transmitted.

That is, the second base station may be defined as a base station in which a main serving cell exists, or may be recognized as a serving cell included in the same base station as the base station, only with respect to secondary serving cells belonging to the same TAG (Timing Advance Group) . The TAG of the main serving cell is referred to as pTAG.

Alternatively, the second base station may be defined as a base station having a secondary serving cell (also referred to as a Special Cell) serving as a main serving cell, or may be defined as the same as the base station only for secondary serving cells belonging to the same TAG as the Special Cell It can be recognized as a serving cell included in the base station. The TAG of the special cell is one of the sTAGs.

On the basis of this, the second base station can transmit the scheduling information on the terminal to the first base station. For example, in the case of the RAN split shown in FIG. 3, the PDCP layer of the second base station is connected to the RLC layer of the first base station through the Xa interface protocol, and can transmit the scheduling information.

23 is a flowchart showing an example of the operation of the base station reporting the surplus power according to the present invention.

Referring to FIG. 23, a second BS having an uplink physical layer scheduling right and a first BS having no uplink physical layer scheduling right are connected to the MS at step S2300.

In step S2305, the BS including the scheduler receives a PHR (delayed PHR) from the MS for a BS that is dual-connected to the MS and does not have a scheduler. At this time, the PHR triggering occurrence state is maintained.

For example, in the case of TDM, the base station receives information (hereinafter referred to as PHR delay information) about how long the delayed PHR is transmitted, together with the delayed PHR or separately from the terminal.

At this time, the PHR delay information may be configured in units of subframes. Alternatively, the PHR delay information may be transmitted through two bits (fields set to R bits) before the PH field in the PHR MAC CE. Alternatively, the PHR delay information may be transmitted using an 8-bit indicator (1 octet) included in the PHR MAC CE. Alternatively, the PHR delay information may be transmitted through a PHR MAC CE format for a delayed PHR, and an LCID index indicating that a delayed PHR is included in the PHR MAC CE format for the delayed PHR may be set.

As another example, when the TA values in the macro cell and the small cell are different from each other in the case of TDM, pTAG among the pTAG and sTAG can be assumed as macro cells. That is, the base station can receive the PHR for the sTAG when the uplink to the pTAG is triggered.

That is, the base station may be defined as a base station in which the main serving cell exists, or may be recognized as a serving cell included in the same base station as the base station, only in the secondary serving cells belonging to the same TAG (Timing advance group) as the main serving cell . The TAG of the main serving cell is referred to as pTAG.

Alternatively, the base station may be defined as a base station having a secondary serving cell (also referred to as Special Cell) serving as a main serving cell, or may be included in the same base station as the base station only with respect to secondary serving cells belonging to the same TAG as the Special Cell Lt; / RTI &gt; serving cell. The TAG of the special cell is one of the sTAGs.

Subsequent to step S2305, the base station transmits scheduling information for the UE to the base station where the scheduler does not exist (S2310).

For example, in the case of the RAN split shown in FIG. 3, the PDCP layer of the second base station is connected to the RLC layer of the first base station through the Xa interface protocol, and can transmit the scheduling information.

24 is a block diagram showing an example of an apparatus for transmitting and receiving a surplus power report according to the present invention.

24, the terminal 2400 includes a receiving unit 2405, a control unit 2410 or a transmitting unit 2420, and the control unit 2410 further includes a triggering unit 2412 or a PHR configuration unit 2414 can do.

The triggering unit 2412 triggers the PHR on the basis of the PHR periodic timer or on the basis of the path loss change.

As an example, the triggering unit 2412 triggers the PHR on a triggering basis for path loss changes. After transmitting the PHR last most recently (or immediately before) based on the current time, the terminal 2400 determines the variation of the path loss value (e.g., in dB) in at least one active serving cell used as the PLR (E.g., prohibit PHR-Timer) has expired, or when the PHR blocking timer has expired and the situation has occurred, a triggering event (e.g., a &quot; dl-PathlossChange &quot; The section 2412 triggers the PHR.

As another example, the triggering unit 2412 triggers the PHR when the PHR periodic timer expires. At this time, the PHR periodic timer may be configured on a terminal-by-terminal basis or on a per-base-station basis. Alternatively, the PHR periodic timer may be configured the same as the PHR blocking timer of FIG.

When there is an actual uplink transmission to the base station in which the scheduler does not exist, the PHR configuration unit 2414 generates PH _{, c} and P _{CMAX, c} values based on the PHR transmission condition within the transmission interval allocated to the uplink _, The control unit 2410 does not transmit the PHR value, and the control unit 2410 stores the PHR value that has not been transmitted (hereinafter referred to as delayed PHR) in the terminal 2400. At this time, the PHR triggering occurrence state is maintained.

If the PHR transmission criterion is satisfied, the transmitting unit 2420 transmits the delayed PHR through the uplink connected to the base station 2450. That is, if uplink resources capable of transmitting a PHR for a base station in which a scheduler does not exist are secured in an uplink transmission period for a base station in which the scheduler exists, the transmission unit 2420 transmits the delayed PHR.

Alternatively, when the PHR is triggered in the serving cells in the base station 2450 connected through the uplink, if the initial uplink grant capable of transmitting both the PHR and the delayed PHR is received, And transmits the delayed PHR through the uplink.

For example, in the case of TDM, the transmitter 2420 transmits PHR delay information about how long the delayed PHR is transmitted to the base station 2450 together with the delayed PHR or separately. At this time, the PHR delay information may be configured in units of subframes. Alternatively, the PHR delay information may be transmitted through two bits (fields set to R bits) before the PH field in the PHR MAC CE. Alternatively, the PHR delay information may be transmitted using an 8-bit indicator included in the PHR MAC CE. Alternatively, the PHR delay information may be transmitted through a PHR MAC CE format for a delayed PHR, and an LCID index indicating that a delayed PHR is included in the PHR MAC CE format for the delayed PHR may be set.

As another example, when the TA value for the first base station is different from the TA value for the second base station (that is, when the TA value is different between the macro cell and the small cell), pTAG and sTAG, The transmitting unit 2420 transmits the PHR for the sTAG through the uplink to the pTAG.

Meanwhile, the base station 2450 includes a transmitting unit 2455 or a receiving unit 2460.

The receiving unit 2460 of the base station having the scheduler receives the PHR (delayed PHR) from the UE 2400 for the base station that is double connected to the UE 2400 and does not have the scheduler. At this time, the PHR triggering occurrence state is maintained.

For example, in the case of TDM, the receiver 2460 receives information (hereinafter referred to as PHR delay information) about how long the delayed PHR is transmitted from the terminal 2400 together with the delayed PHR or separately.

As another example, assuming that pTAG and sTAG among the pTAG and sTAG are macro cells when the TA values in the macro cell and the small cell are different from each other, the receiving unit 2460 sets the PHR for the sTAG to the pTAG if the uplink to the pTAG is triggered .

That is, the base station 2450 may be defined as a base station in which a main serving cell exists, or may be recognized as a serving cell included in the same base station as that of the base station, only for the secondary serving cells belonging to the same TAG (Timing Advance Group) . The TAG of the main serving cell is referred to as pTAG.

Alternatively, the base station 2450 may be defined as a base station having a secondary serving cell (also referred to as a Special Cell) serving as a primary serving cell, or a secondary serving cell having a same serving cell as the base station It can be recognized as a serving cell included in the base station. The TAG of the special cell is one of the sTAGs.

The transmitting unit 2455 delivers the scheduling information for the terminal 2400 to the base station where the scheduler does not exist.

For example, in the case of the RAN split shown in FIG. 3, the PDCP layer of the base station 2450 can be connected to the RLC layer of the base station in which the scheduler does not exist, and can transmit the scheduling information through the Xa interface protocol.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept as defined by the appended claims. But is not limited thereto.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders or simultaneously . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

Claims (14)

A method for transmitting a power headroom report (PHR) in a terminal in which two or more different base stations and an uplink wireless connection are established as a dual connection,
Triggering a PHR based on a path loss change or a periodic timer;
Constructing a delayed PHR for uplink transmission to a first base station in which the scheduler does not exist, and storing the delayed PHR in the UE; And
And transmitting the delayed PHR to the second base station through an uplink connected to a second base station in which the scheduler exists,
Wherein the delayed PHR further comprises PHR delay information indicating how few subframes are transmitted in a delayed manner. The method according to claim 1,
The PHR delay information is a 2-bit indicator,
Wherein the PHR delay information is included in two bits prior to the PH field in the delayed PHR. The method according to claim 1,
The PHR delay information is an 8-bit indicator,
The PHR delay information is included in one octet after the PH field in the delayed PHR,
Wherein a delay PHR indicator indicating whether the PHR delay information is included is included in one of two bits before the PH field in the delayed PHR. The method according to claim 1,
The delayed PHR is transmitted using a delayed PHR MAC CE format including only the PH information transmitted in a delayed manner,
Characterized in that it is indicated by an LCID index whether it is the delayed PHR MAC CE format. A method for transmitting a power headroom report (PHR) in a terminal in which two or more different base stations and an uplink wireless connection are established as a dual connection,
Triggering a PHR based on a path loss change or a periodic timer;
Storing a delayed PHR for the second base station if the TA value for the second base station is different from the time advancing (TA) value for the first base station; And
And transmitting the delayed PHR to the first base station when the uplink to the first base station is triggered,
The first base station is a base station corresponding to a primary TA Group (pTAG), the second base station is a base station corresponding to a secondary TA Group (sTAG)
Wherein the delayed PHR further comprises PHR delay information indicating how few subframes are transmitted in a delayed manner. 6. The method of claim 5,
And the secondary serving cells belonging to the pTAG are recognized as serving cells included in the first base station. 6. The method of claim 5,
If the second base station is a base station having a secondary serving cell serving as a main serving cell, the secondary serving cells belonging to the same TAG as the secondary serving cell serving as the main serving cell are allocated to the serving cell Lt; / RTI &gt; A terminal for transmitting a power headroom report (PHR) with two or more different base stations and an uplink wireless connection established as a dual connection,
A triggering unit for triggering the PHR based on the path loss change or the periodic timer;
A controller configured to construct a delayed PHR for uplink transmission to a first base station in which a scheduler does not exist and to store the delayed PHR in a terminal; And
And a transmitter for transmitting the delayed PHR to the second base station through an uplink connected to a second base station in which the scheduler exists,
Wherein the delayed PHR further comprises PHR delay information indicating how many subframes are transmitted in a delayed manner. 9. The method of claim 8,
The PHR delay information is a 2-bit indicator,
Wherein the PHR delay information is included in two bits before the PH field in the delayed PHR. 9. The method of claim 8,
The PHR delay information is an 8-bit indicator,
The PHR delay information is included in one octet after the PH field in the delayed PHR,
Wherein a delay PHR indicator indicating whether the PHR delay information is included is included in one of two bits before the PH field in the delayed PHR. 9. The method of claim 8,
The transmitting unit transmits a delayed PHR MAC CE format including only PH information delayed and transmitted among the delayed PHRs,
Wherein the indication of the delayed PHR MAC CE format is indicated by an LCID index. A terminal for transmitting a power headroom report (PHR) with two or more different base stations and an uplink wireless connection established as a dual connection,
A triggering unit for triggering the PHR based on the path loss change or the periodic timer;
A controller for storing the delayed PHR for the second base station if the TA value for the second base station is different from the time advancing (TA) value for the first base station; And
And a transmitter for transmitting the delayed PHR to the first base station when the uplink to the first base station is triggered,
The first base station is a base station corresponding to a primary TA Group (pTAG), the second base station is a base station corresponding to a secondary TA Group (sTAG)
Wherein the delayed PHR further comprises PHR delay information indicating how many subframes are transmitted in a delayed manner. 13. The method of claim 12,
The control unit
And the serving cell belonging to the pTAG is recognized as a serving cell included in the first base station. 13. The method of claim 12,
The control unit
If the second base station is a base station having a secondary serving cell serving as a main serving cell, the secondary serving cells belonging to the same TAG as the secondary serving cell serving as the main serving cell are allocated to the serving cell The terminal recognizes the terminal as a terminal.

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